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Wang L, Lu X, Cheng Y, Zhang YC, Zhao DX, Zhu YH. Effect of Optimizing the Induction Regimen in Preventing Cough Reactions in Patients Undergoing General Anesthesia: A Prospective Randomized Controlled Study. Clin Ther 2024; 46:252-257. [PMID: 38368167 DOI: 10.1016/j.clinthera.2024.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 01/21/2024] [Accepted: 01/22/2024] [Indexed: 02/19/2024]
Abstract
PURPOSE During the induction of general anesthesia, opioids and endotracheal intubation may cause coughing. This study aimed to investigate the safety and effectiveness of an optimized drug induction scheme for general anesthesia to prevent coughing in patients. METHODS A total of 220 patients aged 18 to 65 years who underwent surgery under general anesthesia with endotracheal intubation were randomly assigned to two groups, each with 110 patients. One group was administered a divided sufentanil bolus (group A) and the other with a single sufentanil bolus (group B). Anesthesia induction was performed according to the drug induction scheme of 1st, 2nd, and 3rd minutes. The primary outcome was a coughing episode associated with the administration of opioids during anesthesia induction. We also recorded the pain associated with drug injection, hemodynamics, and blood oxygen saturation during the induction of anesthesia. FINDINGS All patients were included in the final statistical analysis. Compared with group B, the incidence of opioid induced cough (OIC) was significantly higher in group A (9.1% vs. 0, P = 0.001). There was no cough reaction of tracheal intubation in either group. There was no severe pain due to propofol and rocuronium injection in either group (P > 0.05). The mean arterial pressure (MAP), heart rate (HR), and peripheral oxygen saturation (SpO2) values were within the normal range at each time point during the induction period in both groups. IMPLICATIONS According to the optimized 1st, 2nd, and 3rd minutes anesthesia induction regimen, with a single final intravenous bolus of sufentanil after the diluted rocuronium bromide administration, no sufentanil and tracheal intubation induced coughing reactions were observed. TRIAL REGISTRATION The study protocol was registered in the Chinese Clinical Trial Registry (ChiCTR2200062749, http://www.chictr.org.cn/showproj.aspx?proj=175018) on August 17, 2022.
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Affiliation(s)
- Lei Wang
- Department of Anesthesiology, Pinghu First People's Hospital, Jiaxing, China.
| | - Xing Lu
- Department of Anesthesiology, Zhejiang Hospital, Hangzhou, China
| | - Yi Cheng
- Department of Anesthesiology, Pinghu First People's Hospital, Jiaxing, China
| | - You-Chuan Zhang
- Department of Anesthesiology, Pinghu First People's Hospital, Jiaxing, China
| | - De-Xiang Zhao
- Department of Anesthesiology, Pinghu First People's Hospital, Jiaxing, China
| | - Yan-Hong Zhu
- Department of Anesthesiology, Pinghu First People's Hospital, Jiaxing, China
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Chen RC, Zhao DX. [Pay attention to the burden and patients' characteristics of chronic obstructive pulmonary disease in China]. Zhonghua Yi Xue Za Zhi 2017; 97:3121-3123. [PMID: 29081158 DOI: 10.3760/cma.j.issn.0376-2491.2017.40.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
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Abstract
Objective: To observe the long-term outcomes after congenital cataract surgery performed prior to 36 months of age. Methods: A retrospective case study was conducted. Thirty-two cases (57 eyes) of congenital cataract were included from January 2004 to January 2012. All patients received intraocular lens (IOL) implantation with posterior continuous curvilinear capsulorhexies and anterior vitrectomy after cataract extraction and were followed up. At the last visit, the best corrected visual acuity (BCVA) was determined and postoperative complications were evaluated during follow-up with a longest time of 13 years. Non-normal distribution showed in median M (minimum and maximum). Data were analyzed by Kruskal Wallis single factor variance analysis and multiple comparison. The independent Mann-Witney U test was used to analyze non-normal distribution data. Results: There were thirty-two cases (57 eyes) of congenital cataract including 7 unilateral cases and 25 bilateral cases. The median age at cataract extraction was 6.0months; the median IOL implantation age was 28.0 months and the median duration of follow-up after cataract extraction was 67.0 months. The median postoperative BCVA was (LogMAR) 0.52. Unilateral and bilateral cataract postoperative BCVA difference had no statistical significance (U=107, P>0.05). Patients received cataract surgery in 2 to 4 months, the postoperative BCVA was better than in 5 to 8 months. The difference was statistical significance (H=-15.33, P<0.05). BCVA after IOL implantation before 24 months were significantly better than after 30 months. The difference had statistical significance(H=-20.61,-20.78, P<0.05). Postoperative complications were posterior capsular opacity (5 eyes; 8.77%), glaucoma (2 eyes; 3.51%), strabismus (17 eyes; 29.82%) and nystagmus (30 eyes; 52.63%). Conclusions: Most infantile cataract surgeries performed prior to 36 mouths of life together with the implantation of IOL can achieve good visual acuity. No serious complications occurred. (Chin J Ophthalmol, 2017, 53: 266-273).
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Affiliation(s)
- J Y Qi
- Department of Ophthalmology, Shengjing Hospital of China Medical University, Shenyang110004, Liaoning Province, China
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Zhao DX, Chen SY, Zhou YM, Li XC, Liu S, Chen L, Pu JD, Ran PX. [Preliminary analysis of lung function of population with biofuel smoke exposure]. Zhonghua Jie He He Hu Xi Za Zhi 2017; 40:349-353. [PMID: 28482420 DOI: 10.3760/cma.j.issn.1001-0939.2017.05.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To analyse the impaired lung functions of people with biofuel smoke exposure. Methods: Nonsmokers with biofuel smoke exposure were selected as research objects in a mountainous area of northern Guangdong where the families used biofuels as main energies and the nonsmokers without biofuel smoke exposure in the same area as control. Questionnaire interviews and spirometry tests were performed on all subjects. To analyse the differences of lung functions in both. Results: Seventy hundred and seventeen subjects were enro1led in this study.There were 530 nonsmokers with biofuel smoke exposure(observation group) including 442 women and 88 men, average age 54±10. There were 187 nonsmokers without biofuel smoke exposure(control group) including 141 women and 46 men, average age 54±10. There was no significant difference between two groups in age, height, weight, BMI, waist circumference, hip circumference and waist/hip ratio(P>0.05). The pulmonary ventilation function index(FEV(1)%Pred, FEV(1)/FVC) in the observation group was significantly less than that in control group [(100±18) vs.(106±25); (80±10) vs.(83±6) respectively, P<0.05]. Small airway function index(PEF25, PEF50, PEF75, MMPEF and MMPEF%Pred) was significantly less than that in control group(P<0.01). According to the univariate regression analysis and multivariate regression analysis, regression coefficients between BIOFUEL-INDEX and FEV/FVC was -0.1, 95%CI(-0.1, -0.1, P<0.01). According to the threshold analysis, the vertice of BIOFUEL-INDEX was 46.0, where the predicted Y value was 81.76, 95%CI (80.2, 83.33). When BIOFUEL-INDEX<46.0, the regression coefficient was 0, 95%CI (-0.1, 0.0)(P>0.05); when BIOFUEL-INDEX> 46.0, the regression coefficient 2 was -0.1, 95%CI (-0.2, -0.1)(P<0.01). The difference between coefficient 2 and 1 was -0.1, 95%CI (-0.2, 0.0), which was statistically significant (P<0.05). The Log-Likelihood ratio between Model I and Model Ⅱ had statistical significance (P=0.019). Conclusions: The biofuel smokes exposure causes damages in lung function.
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Affiliation(s)
- D X Zhao
- State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Diseases, First Affiliated Hospital, Guangzhou Medical University of Guangzhou, Guangzhou 510120, China
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Cheng WF, Shen ZA, Zhao DX, Li DW, Shang YR. [Bibliometric analysis of scientific articles on epidemiological study of burns in China]. Zhonghua Shao Shang Za Zhi 2017; 33:233-237. [PMID: 28427137 DOI: 10.3760/cma.j.issn.1009-2587.2017.04.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To analyze the current status of epidemiological study of burns in China, and to explore the related strategies. Methods: Retrospective or cross-sectional scientific articles in Chinese or English on epidemiological study of burns in China published from January 2005 to December 2015 were systemically retrieved from 4 databases. The databases include PubMed, Embase, China Biology Medicine disc, and Chinese Journals Full-text Database. From the results retrieved, data with regard to publication year, journal distribution, number of institutions participated in the study, affiliation of the first author and its location, and admission time span and age of patients in all the scientific articles were collected. Furthermore, the definition of age range and the grouping method of age of pediatric patients in English articles on epidemiological study of pediatric burns of China were recorded. Data were processed with descriptive statistical analysis. Results: A total of 256 scientific articles conforming to the study criteria were retrieved, among which 214 (83.59%) articles were in Chinese, and 42 (16.41%) articles were in English; 242 (94.53%) articles were retrospective studies, and 14 (5.47%) articles were cross-sectional studies. During the 11 years, the number of the relevant articles was fluctuant on the whole. The scientific articles were published in 130 journals, with 42 English articles in source journals for SCIENCE CITATION INDEX EXPANDED-JOURNAL LIST, accounting for 16.41%, and 116 Chinese articles in Source Journal for Chinese Scientific and Technical Papers, accounting for 45.31%. Totally 215 (83.98%) articles were single-center studies, and 29 (11.33%) articles were multicenter studies which were conducted by three or more centers. The number of affiliations of the first author of articles was 161 in total. The top 10 institutions regarding the article publishing number published 58 articles, accounting for 22.66%. Scientific articles on epidemiological study of burns were retrieved with location of affiliation of the first author in 31 provinces, autonomous regions, and municipalities directly under the Central Government in Mainland China, and also in Taiwan Province and Hong Kong Special Administrative Region, among which Shanghai ranked first with 24 (9.38%) articles published. The admission time span of patients in the articles ranged from 3 months to 47 years, with 120 (46.87%) articles from 3 months to 5 years, 79 (30.86%) articles from 6 to 10 years, and 57 (22.27%) articles more than 10 years, respectively. Regarding the age of patients in the study, 123 articles were on epidemiological study of pediatric burns, and 16 articles on epidemiological study of elderly burns, accounting for 48.05% and 6.25%, respectively. Further analysis of articles on epidemiological study of pediatric burns in English showed that there was no standard definition of age range or unified grouping method of age for pediatric burn patients. Conclusions: The epidemiological study of burns in China has been carried out nationwide, but the number of institutions conducted relevant study is not that much, and multicenter epidemiological studies remain scanty. The quality of the articles needs to be further improved. The epidemiological study of elderly burns is relatively deficient and calls for more attention. The epidemiological study of burns in China lacks regularity or continuity in time scope. There is an urgent need for the guideline on classification method for items of epidemiological study of burns in China so as to standardize the related research.
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Affiliation(s)
- W F Cheng
- Burns Institute, the First Hospital Affiliated to the PLA General Hospital, Beijing 100048, China
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Zhao DX, Lu K. Synthesis and Preliminary Study on the DNA-binding Property of Tranexamic Acid Derivatives. Indian J Pharm Sci 2016. [DOI: 10.4172/pharmaceutical-sciences.1000169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Abstract
Akirin2 is a nuclear factor that plays an important role in the development and regulation of innate immune response. In this study, akirin2 gene expression in several primary immune organs (liver, thymus, and bursa) of Hi-Line Brown chicken administered with the LoSota vaccine was analyzed during the various stages of increase in Newcastle disease virus antibody titer. The results revealed that akirin2 expression was significantly higher in the liver (P < 0.01) and bursa (P < 0.05) of vaccinated chicken 7 and 14 days post-immunization, respectively. These results could serve as a foundation for further studies on the functions of akirin2 in immune response.
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Affiliation(s)
- C L Man
- College of Life Science and Technology, Harbin Normal University, Harbin, China
| | - W T Mu
- College of Life Science and Technology, Harbin Normal University, Harbin, China
| | - Y Chang
- College of Life Science and Technology, Harbin Normal University, Harbin, China
| | - D X Zhao
- College of Life Science and Technology, Harbin Normal University, Harbin, China
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Zhao DX, Chen LQ, Qin JG, Qin CJ, Zhang H, Wu P, Li EC. Molecular characterization of a cytosolic manganese superoxide dismutase from the Chinese mitten crab, Eriocheir sinensis. Genet Mol Res 2014; 13:9429-42. [PMID: 25501153 DOI: 10.4238/2014.november.11.8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
A cytosolic manganese superoxide dismutase gene (Es-cMnSOD) was cloned from the Chinese mitten crab Eriocheir sinensis, using reverse transcription-polymerase chain reaction and the rapid amplification of cDNA ends. The open reading frame of Es-cMnSOD is 867 bp in length and encodes a 288-amino acid protein without a signal peptide. The calculated molecular mass of the translated protein of Es-cMnSOD is 31.43 kDa, with an estimated isoelectric point of 6.30. The deduced amino acid sequence of Es-cMnSOD has similarities of 90, 89, 84, 87, and 81% to those of white shrimp Litopenaeus vannamei MnSOD, black tiger shrimp Penaeus monodon MnSOD, giant freshwater prawn Macrobrachium rosenbergii MnSOD, blue crab Callinectes sapidus MnSOD, and red swamp crayfish Procambarus clarkii MnSOD, respectively. Es-cMnSOD contains a manganese superoxide dismutase domain (DVWEHAYY) and 4 conserved amino acids responsible for binding manganese. Es-cMnSOD was expressed in the hemocytes, eyestalk, muscle, intestine, gill, and hepatopancreas. Es-cMnSOD transcripts in hemocytes of E. sinensis increased at 1.5 and 48 h after injection of Aeromonas hydrophila, indicating that the induction of the SOD system response occurred within a short period of time. This study suggests that MnSOD may play a critical role in crab immunity, allowing efficient activation of an early innate immune response in the crab.
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Affiliation(s)
- D X Zhao
- Department of Biology, East China Normal University, Shanghai, China
| | - L Q Chen
- Department of Biology, East China Normal University, Shanghai, China
| | - J G Qin
- School of Biological Sciences, Flinders University, Adelaide, Australia
| | - C J Qin
- Department of Biology, East China Normal University, Shanghai, China
| | - H Zhang
- Department of Biology, East China Normal University, Shanghai, China
| | - P Wu
- Department of Biology, East China Normal University, Shanghai, China
| | - E C Li
- Department of Biology, East China Normal University, Shanghai, China
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Zang CH, Liu YC, Zhao DX, Zhang JY, Shen DZ. The synthesis and optical properties of ZnO nanocombs. J Nanosci Nanotechnol 2010; 10:2370-2374. [PMID: 20355436 DOI: 10.1166/jnn.2010.2480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The ZnO nanocombs were synthesized by chemical vapor deposition method, which the uniform and dense nanotips were along one side of the comb ribbon. The growth mechanism was described as free catalyst self-assembled and vapor-solid model. The optical properties related with the surface states were investigated by Raman and PL spectra. The large redshift of 1LO phonon peak was attributed to the surface and interface states. The normalized PL spectra showed that the deep-level emission decreased for the sample to be annealed in O2 ambient at 500 degrees C. On the contrary, the deep-level emission increased while for the annealed sample in O2 ambient at 600 degrees C. The deep-level emission was attributed to the transition from the shallow donor to the deep acceptor. The XPS analysis showed the existence of oxygen rich and Zn deficient in the ZnO nanocombs annealed at 600 degrees C. The abnormal temperature dependence of integrated PL intensity was attributed to the abundant surface states.
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Affiliation(s)
- C H Zang
- Key Laboratory of Excited State Process, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PRC
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Su SC, Lu YM, Zhang ZZ, Shan CX, Li BH, Shen DZ, Yao B, Zhang JY, Zhao DX, Fan XW. Optical properties of ZnMgO nanowalls grown by plasma-assisted molecular beam epitaxy. J Nanosci Nanotechnol 2010; 10:1681-1684. [PMID: 20355557 DOI: 10.1166/jnn.2010.2112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
ZnMgO nanowalls were prepared by plasma-assisted molecular beam epitaxy without a catalyst on c-Al2O3 substrate. The obtained nanowalls have preferred orientation along c axis. The nanowalls are about 10 to 20 nm in thickness and about 50 nm in height. Only Zn, Mg, O and Al signals are detected in the nanowalls from the energy dispersive spectroscopy (EDS). The Mg content is about 3% in ZnMgO nanowalls. The room temperature photoluminescence (PL) spectra shows the emission peak of the ZnMgO nanowalls at 3.346 eV. The origin of the ultraviolet emission is discussed with the help of temperature-dependent PL spectra. The ultraviolet emission band is free exiton recombination observed in the low temperature PL spectra (at 81 K). We also observe the free-to-acceptor (FA) emission of the ZnMgO nanowalls. The acceptor binding energy obtained from photoluminescence studies is about 123 meV. The results show that Mg doping leads to an increase of the acceptor binding energy. The possible growth mechanism of the ZnMgO nanowall networks was discussed.
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Affiliation(s)
- S C Su
- Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
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Ablikim M, Bai JZ, Ban Y, Cai X, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen YB, Chu YP, Dai YS, Diao LY, Deng ZY, Dong QF, Du SX, Fang J, Fang SS, Fu CD, Gao CS, Gao YN, Gu SD, Gu YT, Guo YN, He KL, He M, Heng YK, Hou J, Hu HM, Hu JH, Hu T, Huang GS, Huang XT, Ji XB, Jiang XS, Jiang XY, Jiao JB, Jin DP, Jin S, Lai YF, Li G, Li HB, Li J, Li RY, Li SM, Li WD, Li WG, Li XL, Li XN, Li XQ, Liang YF, Liao HB, Liu BJ, Liu CX, Liu F, Liu F, Liu HH, Liu HM, Liu J, Liu JB, Liu JP, Liu J, Liu Q, Liu RG, Liu ZA, Lou YC, Lu F, Lu GR, Lu JG, Luo CL, Ma FC, Ma HL, Ma LL, Ma QM, Mao ZP, Mo XH, Nie J, Ping RG, Qi ND, Qin H, Qiu JF, Ren ZY, Rong G, Ruan XD, Shan LY, Shang L, Shen DL, Shen XY, Sheng HY, Sun HS, Sun SS, Sun YZ, Sun ZJ, Tang X, Tong GL, Wang DY, Wang L, Wang LL, Wang LS, Wang M, Wang P, Wang PL, Wang WF, Wang YF, Wang Z, Wang ZY, Wang Z, Wei CL, Wei DH, Weng Y, Wu N, Xia XM, Xie XX, Xu GF, Xu XP, Xu Y, Yan ML, Yang HX, Yang YX, Ye MH, Ye YX, Yu GW, Yuan CZ, Yuan Y, Zang SL, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HQ, Zhang HY, Zhang JW, Zhang JY, Zhang SH, Zhang XY, Zhang Y, Zhang ZX, Zhang ZP, Zhao DX, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zhao ZG, Zheng HQ, Zheng JP, Zheng ZP, Zhou L, Zhu KJ, Zhu QM, Zhu YC, Zhu YS, Zhu ZA, Zhuang BA, Zhuang XA, Zou BS. Anomalous line shape of the cross section for e{+}e{-}--> hadrons in the center-of-mass energy region between 3.650 and 3.872 GeV. Phys Rev Lett 2008; 101:102004. [PMID: 18851209 DOI: 10.1103/physrevlett.101.102004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Indexed: 05/26/2023]
Abstract
We observe an obvious anomalous line shape of the e;{+}e;{-}--> hadrons total cross sections in the energy region between 3.700 and 3.872 GeV. It is inconsistent with the explanation for only one simple psi(3770) resonance with a statistical significance of 7sigma. The anomalous line shape may be explained by two possible enhancements of the inclusive hadron production near the center-of-mass energies of 3.764 and 3.779 GeV, indicating that either there is likely a new structure in addition to the psi(3770) resonance around 3.773 GeV, or there are some physics effects reflecting the DD[over ] production dynamics.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing 100049, People's Republic of China
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Ablikim M, Bai JZ, Ban Y, Cai X, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen YB, Chu YP, Dai YS, Diao LY, Deng ZY, Dong QF, Du SX, Fang J, Fang SS, Fu CD, Gao CS, Gao YN, Gu SD, Gu YT, Guo YN, Guo ZJ, Harris FA, He KL, He M, Heng YK, Hou J, Hu HM, Hu JH, Hu T, Huang XT, Ji XB, Jiang XS, Jiang XY, Jiao JB, Jin DP, Jin S, Jin Y, Lai YF, Li G, Li HB, Li J, Li RY, Li SM, Li WD, Li WG, Li XL, Li XN, Li XQ, Liang YF, Liao HB, Liu BJ, Liu CX, Liu F, Liu F, Liu HH, Liu HM, Liu J, Liu JB, Liu JP, Liu J, Liu Q, Liu RG, Liu ZA, Lou YC, Lu F, Lu GR, Lu JG, Luo CL, Ma FC, Ma HL, Ma LL, Ma QM, Mao ZP, Mo XH, Nie J, Olsen SL, Ping RG, Qi ND, Qin H, Qiu JF, Ren ZY, Rong G, Ruan XD, Shan LY, Shang L, Shen CP, Shen DL, Shen XY, Sheng HY, Sun HS, Sun SS, Sun YZ, Sun ZJ, Tang X, Tong GL, Varner GS, Wang DY, Wang L, Wang LL, Wang LS, Wang M, Wang P, Wang PL, Wang YF, Wang Z, Wang ZY, Wang Z, Wei CL, Wei DH, Wiedner U, Weng Y, Wu N, Xia XM, Xie XX, Xu GF, Xu XP, Xu Y, Yan ML, Yang HX, Yang YX, Ye MH, Ye YX, Yu GW, Yuan CZ, Yuan Y, Zang SL, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HQ, Zhang HY, Zhang JW, Zhang JY, Zhang SH, Zhang XY, Zhang Y, Zhang ZX, Zhang ZP, Zhao DX, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zhao ZG, Zheng HQ, Zheng JP, Zheng ZP, Zhou L, Zhu KJ, Zhu QM, Zhu YC, Zhu YS, Zhu ZA, Zhuang BA, Zhuang XA, Zou BS. Search for the invisible decay of J/psi in psi(2S) --> pi(+)pi(-) J/psi. Phys Rev Lett 2008; 100:192001. [PMID: 18518438 DOI: 10.1103/physrevlett.100.192001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2007] [Indexed: 05/26/2023]
Abstract
Using psi(2S) --> pi(+)pi(-) J/psi events in a sample of 14.0 x 10(6) psi(2S) decays collected with the BES-II detector, a search for the decay of the J/psi to invisible final states is performed. No signal is found, and an upper limit at the 90% confidence level is determined to be 1.2 x 10(-2) for the ratio B(J/psi --> invisible)/B(J/psi-->mu(+)mu(-)). This is the first search for J/psi decays to invisible final states.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing, PR China
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Ablikim M, Bai JZ, Bai Y, Ban Y, Cai X, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen XD, Chen YB, Chu YP, Dai YS, Deng ZY, Du SX, Fang J, Fu CD, Gao CS, Gao YN, Gu SD, Gu YT, Guo YN, Guo ZJ, Harris FA, He KL, He M, Heng YK, Hou J, Hu HM, Hu T, Huang GS, Huang XT, Huang YP, Ji XB, Jiang XS, Jiao JB, Jin DP, Jin S, Lai YF, Li HB, Li J, Li RY, Li WD, Li WG, Li XL, Li XN, Li XQ, Liang YF, Liao HB, Liu BJ, Liu CX, Liu F, Liu F, Liu HH, Liu HM, Liu JB, Liu JP, Liu HB, Liu J, Liu Q, Liu RG, Liu S, Liu ZA, Lu F, Lu GR, Lu JG, Luo CL, Ma FC, Ma HL, Ma LL, Ma QM, Malik MQA, Mao ZP, Mo XH, Nie J, Olsen SL, Ping RG, Qi ND, Qin H, Qiu JF, Rong G, Ruan XD, Shan LY, Shang L, Shen CP, Shen DL, Shen XY, Sheng HY, Sun HS, Sun SS, Sun YZ, Sun ZJ, Tang X, Tian JP, Tong GL, Varner GS, Wan X, Wang L, Wang LL, Wang LS, Wang P, Wang PL, Wang WF, Wang YF, Wang Z, Wang ZY, Wei CL, Wei DH, Weng Y, Wu N, Xia XM, Xie XX, Xu GF, Xu XP, Xu Y, Yan ML, Yang HX, Yang M, Yang YX, Ye MH, Ye YX, Yu CX, Yu GW, Yuan CZ, Yuan Y, Zang SL, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HQ, Zhang HY, Zhang JW, Zhang JY, Zhang XY, Zhang YY, Zhang ZX, Zhang ZP, Zhao DX, Zhao JW, Zhao MG, Zhao PP, Zhao ZG, Zheng HQ, Zheng JP, Zheng ZP, Zhou BZL, Zhu KJ, Zhu QM, Zhu XW, Zhu YC, Zhu YS, Zhu ZA, Zhu ZL, Zhuang BA, Zou BS. Observation of Y(2175) in J/psi --> etaphif0 (980). Phys Rev Lett 2008; 100:102003. [PMID: 18352176 DOI: 10.1103/physrevlett.100.102003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2007] [Indexed: 05/26/2023]
Abstract
The decays of J/psi --> etaphif(0)(980)[eta --> gammagamma, phi --> K(+) K(-), f(0)(980) --> pi(+)pi(-)] are analyzed using a sample of 5.8 x 10(7) J/psi events collected with the BESII detector at the Beijing Electron-Positron Collider. A structure at around 2.18 GeV/c(2) with about 5 sigma significance is observed in the phif(0)(980) invariant mass spectrum. A fit with a Breit-Wigner function gives the peak mass and width of m = 2.186+/-0.010(stat)+/-0.006(syst) GeV/c(2) and Gamma = 0.065+/-0.023(stat)+/-0.017(syst) GeV/c(2), respectively, which are consistent with those of Y(2175), observed by the BABAR Collaboration in the initial-state radiation process e(+)e(-) --> gamma(ISR) phif(0)(980). The production branching ratio is determined to be Br(J/psi --> etaY(2175))Br(Y(2175)- -> phif(0)(980))Br(f(0)(980) --> pi(+)pi(-)) = [3.23+/-0.75(stat)+/-0.73(syst)] x 10(-4), assuming that the Y(2175) is a 1(--) state.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing 100049, People's Republic of China
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14
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Zang CH, Liu YC, Mu R, Zhao DX, Zhang JY, Ma JG, Lu YM, Yao B, Shen DZ, Fan XW. Photoluminescence of ZnO nanocrystals embedded in BaF2 matrices by magnetron sputtering. J Nanosci Nanotechnol 2008; 8:1160-1164. [PMID: 18468116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
This paper describes ZnO nanocrystals embedded in BaF2 matrices by the magnetron sputtering method in an attempt to use fluoride as a shell layer to embed ZnO nanocrystals core. BaF2 is a wide-band gap material, and can confine carriers in the ZnO films. As a result, the exciton emission intensity should be enhanced. The sample was annealed at 773 K, and X-ray diffraction (XRD) results showed that ZnO nanocrystals with wurtzite structure were embedded in BaF2 matrices. Raman-scattering spectra also confirmed the formation of ZnO nanoparticles. Abnormal longitudinal-optical (LO) phonon-dominant multiphonon Raman scattering was observed in the sample. Room-temperature photoluminescence (PL) spectra showed an ultraviolet emission peak at 374 nm. The origin of the ultraviolet emission is discussed here with the help of temperature-dependent PL spectra. The ultraviolet emission band was a mixture of free exciton and bound exciton recombination observed in the low temperature PL spectra (at 77 K). Abnormal temperature dependence of ultraviolet near-band-edge emission-integrated intensity of the sample was observed. The band tail state was observed in the absorption spectra, illustrating that the impurity-related defects were caused by the shell of the BaF2 grain layer. For comparison, ZnO films on BaF2 substrates were also fabricated by the magnetron sputtering method, and the same measurement methods were used.
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Affiliation(s)
- C H Zang
- Key Laboratory of Excited State Process, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, People's Republic of China
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15
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Ablikim M, Bai JZ, Ban Y, Cai X, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen YB, Chu YP, Dai YS, Diao LY, Deng ZY, Dong QF, Du SX, Fang J, Fang SS, Fu CD, Gao CS, Gao YN, Gu SD, Gu YT, Guo YN, Guo ZJ, Harris FA, He KL, He M, Heng YK, Hou J, Hu HM, Hu JH, Hu T, Huang GS, Huang XT, Ji XB, Jiang XS, Jiang XY, Jiao JB, Jin DP, Jin S, Lai YF, Li G, Li HB, Li J, Li RY, Li SM, Li WD, Li WG, Li XL, Li XN, Li XQ, Liang YF, Liao HB, Liu BJ, Liu CX, Liu F, Liu F, Liu HH, Liu HM, Liu J, Liu JB, Liu JP, Liu JLQ, Liu RG, Liu ZA, Lou YC, Lu F, Lu GR, Lu JG, Luo CL, Ma FC, Ma HL, Ma LL, Ma QM, Mao ZP, Mo XH, Nie J, Olsen SL, Ping RG, Qi ND, Qin H, Qiu JF, Ren ZY, Rong G, Ruan XD, Shan LY, Shang L, Shen CP, Shen DL, Shen XY, Sheng HY, Sun HS, Sun SS, Sun YZ, Sun ZJ, Tang X, Tong GL, Varner GS, Wang DY, Wang L, Wang LL, Wang LS, Wang M, Wang P, Wang PL, Wang YF, Wang Z, Wang ZY, Wang Z, Wei CL, Wei DH, Weng Y, Wu N, Xia XM, Xie XX, Xu GF, Xu XP, Xu Y, Yan ML, Yang HX, Yang YX, Ye MH, Ye YX, Yu GW, Yuan CZ, Yuan Y, Zang SL, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HQ, Zhang HY, Zhang JW, Zhang JY, Zhang SH, Zhang XY, Zhang Y, Zhang ZX, Zhang ZP, Zhao DX, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zhao ZG, Zheng HQ, Zheng JP, Zheng ZP, Zhou L, Zhu KJ, Zhu QM, Zhu YC, Zhu YS, Zhu ZA, Zhuang BA, Zhuang XA, Zou BS. Measurement of psi2S radiative decays. Phys Rev Lett 2007; 99:011802. [PMID: 17678148 DOI: 10.1103/physrevlett.99.011802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2006] [Indexed: 05/16/2023]
Abstract
Using 14 x 10(6) psi(2S) events accumulated at the BESII detector, we report first measurements of branching fractions or upper limits for psi(2S) decays into gammapp, gamma2(pi+pi-), gammaKS0K+pi-+c.c., gammaK+K-pi+pi-, gammaK*0K-pi++c.c., gammaK*0K*0, gammapi+pi-pp, gamma2(K+K-), gamma3(pi+pi-), and gamma2(pi+pi-)K+K- with the invariant mass of hadrons below 2.9 GeV/c2. We also report branching fractions of psi(2S) decays into 2(pi+pi-)pi0, omegapi+pi-, omegaf2(1270), b1+/-pi-/+, and pi02(pi+pi-)K+K-.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing 100049, People's Republic of China
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Yang XL, Huang C, Qiao XG, Yao L, Zhao DX, Tan X. Photo-induced lipid peroxidation of erythrocyte membranes by a bis-methanophosphonate fullerene. Toxicol In Vitro 2007; 21:1493-8. [PMID: 17686607 DOI: 10.1016/j.tiv.2007.06.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2006] [Revised: 06/03/2007] [Accepted: 06/22/2007] [Indexed: 11/24/2022]
Abstract
Using human erythrocyte membranes (EMs) as a model system, we have examined photo-induced lipid peroxidation by a bis-methanophosphonate fullerene (BMPF) and four other fullerene derivatives including a mono-methanophosphonic acid fullerene (MMPF), a dimalonic acid C(60) (DMA C(60)), a trimalonic acid C(60) (TMA C(60)) and a polyhydroxylated fullerene (fullerol). Lipid peroxidation was assessed as the malondialdehyde (MDA) level measured by the thiobarbituric acid assay. It was observed that BMPF increased the MDA level of EMs after irradiation in both time- and dose-dependent manners. The photo-induced activity became very significant (p<0.01) under the conditions of either the concentration of 10 microM and irradiation time of 30 min or the concentration of 5 microM and irradiation time of 60 min. Involvement of reactive oxygen species (ROS) in the activity was also examined by specific inhibitors of singlet oxygen, superoxide anions and hydroxyl radicals, respectively. While all three kinds were found responsible for the activity, the former two might play more important roles than the last one. Furthermore, the activity of BMPF was the strongest among all tested fullerene derivatives. These results indicated BMPF was a potential photosensitizer that would find application in photodynamic therapy.
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Affiliation(s)
- X L Yang
- School of Life Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
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17
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Ablikim M, Bai JZ, Ban Y, Bian JG, Cai X, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen YB, Chi SP, Chu YP, Cui XZ, Dai YS, Deng ZY, Dong LY, Dong QF, Du SX, Du ZZ, Fang J, Fang SS, Fu CD, Gao CS, Gao YN, Gu SD, Gu YT, Guo YN, Guo YQ, He KL, He M, Heng YK, Hu HM, Hu T, Huang XP, Huang XT, Ji XB, Jiang XS, Jiao JB, Jin DP, Jin S, Jin Y, Lai YF, Li G, Li HB, Li HH, Li J, Li RY, Li SM, Li WD, Li WG, Li XL, Li XQ, Li YL, Liang YF, Liao HB, Liu CX, Liu F, Liu F, Liu HH, Liu HM, Liu J, Liu JB, Liu JP, Liu RG, Liu ZA, Lu F, Lu GR, Lu HJ, Lu JG, Luo CL, Ma FC, Ma HL, Ma LL, Ma QM, Ma XB, Mao ZP, Mo XH, Nie J, Peng HP, Qi ND, Qin H, Qiu JF, Ren ZY, Rong G, Shan LY, Shang L, Shen DL, Shen XY, Sheng HY, Shi F, Shi X, Sun HS, Sun JF, Sun SS, Sun YZ, Sun ZJ, Tan ZQ, Tang X, Tian YR, Tong GL, Wang DY, Wang L, Wang LS, Wang M, Wang P, Wang PL, Wang WF, Wang YF, Wang Z, Wang ZY, Wang Z, Wang Z, Wei CL, Wei DH, Wu N, Xia XM, Xie XX, Xin B, Xu GF, Xu Y, Yan ML, Yang F, Yang HX, Yang J, Yang YX, Ye MH, Ye YX, Yi ZY, Yu GW, Yuan CZ, Yuan JM, Yuan Y, Zang SL, Zeng Y, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HY, Zhang JW, Zhang JY, Zhang QJ, Zhang XM, Zhang XY, Zhang Y, Zhang ZP, Zhang ZQ, Zhao DX, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zheng HQ, Zheng JP, Zheng ZP, Zhou L, Zhou NF, Zhu KJ, Zhu QM, Zhu YC, Zhu YS, Zhu Y, Zhu ZA, Zhuang BA, Zhuang XA, Zou BS. Measurements of the continuum R(uds) and R values in e(+)e(-) annihilation in the energy region between 3.650 and 3.872 GeV. Phys Rev Lett 2006; 97:262001. [PMID: 17280420 DOI: 10.1103/physrevlett.97.262001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2006] [Indexed: 05/13/2023]
Abstract
We report measurements of the continuum R(uds) near the center-of-mass energy of 3.70 GeV, the R[uds(c)+psi(3770)](s) and the R(had)(s) values in e(+)e(-) annihilation at 68 energy points in the energy region between 3.650 and 3.872 GeV with the BES-II detector at the BEPC Collider. We obtain the R(uds) for the continuum light hadron (containing u, d, and s quarks) production near the DD threshold to be R(uds)=2.141+/-0.025+/-0.085.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing 100049, People's Republic of China
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18
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Ablikim M, Bai JZ, Ban Y, Bian JG, Cai X, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen YB, Chi SP, Chu YP, Cui XZ, Dai YS, Diao LY, Deng ZY, Dong QF, Du SX, Fang J, Fang SS, Fu CD, Gao CS, Gao YN, Gu SD, Gu YT, Guo YN, Guo YQ, Guo ZJ, Harris FA, He KL, He M, Heng YK, Hu HM, Hu T, Huang GS, Huang XT, Ji XB, Jiang XS, Jiang XY, Jiao JB, Jin DP, Jin S, Jin Y, Lai YF, Li G, Li HB, Li HH, Li J, Li RY, Li SM, Li WD, Li WG, Li XL, Li XN, Li XQ, Li YL, Liang YF, Liao HB, Liu BJ, Liu CX, Liu F, Liu F, Liu HH, Liu HM, Liu J, Liu JB, Liu JP, Liu Q, Liu RG, Liu ZA, Lou YC, Lu F, Lu GR, Lu JG, Luo CL, Ma FC, Ma HL, Ma LL, Ma QM, Ma XB, Mao ZP, Mo XH, Nie J, Olsen SL, Peng HP, Ping RG, Qi ND, Qin H, Qiu JF, Ren ZY, Rong G, Shan LY, Shang L, Shen CP, Shen DL, Shen XY, Sheng HY, Sun HS, Sun JF, Sun SS, Sun YZ, Sun ZJ, Tan ZQ, Tang X, Tong GL, Varner GS, Wang DY, Wang L, Wang LL, Wang LS, Wang M, Wang P, Wang PL, Wang WF, Wang YF, Wang Z, Wang ZY, Wang Z, Wang Z, Wei CL, Wei DH, Wu N, Xia XM, Xie XX, Xu GF, Xu XP, Xu Y, Yan ML, Yang HX, Yang YX, Ye MH, Ye YX, Yi ZY, Yu GW, Yuan CZ, Yuan JM, Yuan Y, Zang SL, Zeng Y, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HQ, Zhang HY, Zhang JW, Zhang JY, Zhang SH, Zhang XM, Zhang XY, Zhang Y, Zhang ZP, Zhao DX, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zhao ZG, Zheng HQ, Zheng JP, Zheng ZP, Zhou L, Zhou NF, Zhu KJ, Zhu QM, Zhu YC, Zhu YS, Zhu Y, Zhu ZA, Zhuang BA, Zhuang XA, Zou BS. Search for invisible decays of eta and eta' in J/psi --> phi eta and phi eta'. Phys Rev Lett 2006; 97:202002. [PMID: 17155676 DOI: 10.1103/physrevlett.97.202002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2006] [Indexed: 05/12/2023]
Abstract
Using a data sample of 58 x 10(6) J/psi decays collected with the Beijing Spectrometer II detector at the Beijing Electron Positron Collider, searches for invisible decays of eta and eta' in J/psi to phi eta and phi eta' are performed. The phi signals, which are reconstructed in K+K- final states, are used to tag the eta and eta' decays. No signals are found for the invisible decays of either eta or eta', and upper limits at the 90% confidence level are determined to be 1.65 x 10(-3) for the ratio B(eta-->invisible)/B(eta --> gamma gamma) and 6.69 x 10(-2) for B(eta' --> invisible)/B(eta' --> gammagamma). These are the first searches for eta and eta' decays into invisible final states.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing 100049, People's Republic of China
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19
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Ablikim M, Bai JZ, Ban Y, Cai X, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen YB, Chi SP, Chu YP, Cui XZ, Dai YS, Deng ZY, Dong LY, Dong QF, Du SX, Du ZZ, Fang J, Fang SS, Fu CD, Gao CS, Gao YN, Gu SD, Gu YT, Guo YN, Guo YQ, Guo ZJ, Harris FA, He KL, He M, Heng YK, Hu HM, Hu T, Huang GS, Huang XP, Huang XT, Ji XB, Jiang XS, Jiao JB, Jin DP, Jin S, Jin Y, Lai YF, Li G, Li HB, Li HH, Li J, Li RY, Li SM, Li WD, Li WG, Li XL, Li XQ, Li YL, Liang YF, Liao HB, Liu CX, Liu F, Liu F, Liu HH, Liu HM, Liu J, Liu JB, Liu JP, Liu RG, Liu ZA, Lu F, Lu GR, Lu HJ, Lu JG, Luo CL, Ma FC, Ma HL, Ma LL, Ma QM, Ma XB, Mao ZP, Mo XH, Nie J, Olsen SL, Peng HP, Qi ND, Qin H, Qiu JF, Ren ZY, Rong G, Shan LY, Shang L, Shen DL, Shen XY, Sheng HY, Shi F, Shi X, Sun HS, Sun JF, Sun SS, Sun YZ, Sun ZJ, Tan ZQ, Tang X, Tian YR, Tong GL, Varner GS, Wang DY, Wang L, Wang LS, Wang M, Wang P, Wang PL, Wang WF, Wang YF, Wang Z, Wang ZY, Wang Z, Wang Z, Wei CL, Wei DH, Wu N, Xia XM, Xie XX, Xin B, Xu GF, Xu Y, Yan ML, Yang F, Yang HX, Yang J, Yang YX, Ye MH, Ye YX, Yi ZY, Yu GW, Yuan CZ, Yuan JM, Yuan Y, Zang SL, Zeng Y, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HY, Zhang JW, Zhang JY, Zhang QJ, Zhang XM, Zhang XY, Zhang YY, Zhang ZP, Zhang ZQ, Zhao DX, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zhao ZG, Zheng HQ, Zheng JP, Zheng ZP, Zhou L, Zhou NF, Zhu KJ, Zhu QM, Zhu YC, Zhu Y, Zhu YS, Zhu ZA, Zhuang BA, Zhuang XA, Zou BS. Observation of a broad 1-- resonant structure around 1.5 GeV/c2 in the K+K- mass spectrum in J/psi-->K+K-pi0. Phys Rev Lett 2006; 97:142002. [PMID: 17155241 DOI: 10.1103/physrevlett.97.142002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2006] [Indexed: 05/12/2023]
Abstract
A broad peak is observed at low K+K- invariant mass in J/psi-->K+K-pi(0) decays found in a sample of 5.8x10(7) J/psi events collected with the BESII detector. The statistical significance of the broad resonance is much larger than 5sigma. A partial wave analysis shows that the J;{PC} of this structure is 1--. Its pole position is determined to be [1576(-55)(+49)(stat)-91+98(syst)] MeV/c(2)-i/2[818(-23)(+22)(stat)-133+64(syst)] MeV/c(2). These parameters are not compatible with any known meson resonances.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing 100049, People's Republic of China
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Ablikim M, Bai JZ, Ban Y, Bian JG, Cai X, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen YB, Chi SP, Chu YP, Cui XZ, Dai YS, Deng ZY, Dong LY, Dong QF, Du SX, Du ZZ, Fang J, Fang SS, Fu CD, Gao CS, Gao YN, Gu SD, Gu YT, Guo YN, Guo YQ, He KL, He M, Heng YK, Hu HM, Hu T, Huang XP, Huang XT, Ji XB, Jiang XS, Jiao JB, Jin DP, Jin S, Jin Y, Lai YF, Li G, Li HB, Li HH, Li J, Li RY, Li SM, Li WD, Li WG, Li XL, Li XQ, Li YL, Liang YF, Liao HB, Liu CX, Liu F, Liu F, Liu HH, Liu HM, Liu J, Liu JB, Liu JP, Liu RG, Liu ZA, Lu F, Lu GR, Lu HJ, Lu JG, Luo CL, Ma FC, Ma HL, Ma LL, Ma QM, Ma XB, Mao ZP, Mo XH, Nie J, Peng HP, Qi ND, Qin H, Qiu JF, Ren ZY, Rong G, Shan LY, Shang L, Shen DL, Shen XY, Sheng HY, Shi F, Shi X, Sun HS, Sun JF, Sun SS, Sun YZ, Sun ZJ, Tan ZQ, Tang X, Tian YR, Tong GL, Wang DY, Wang L, Wang LS, Wang M, Wang P, Wang PL, Wang WF, Wang YF, Wang Z, Wang ZY, Wang Z, Wang Z, Wei CL, Wei DH, Wu N, Xia XM, Xie XX, Xin B, Xu GF, Xu Y, Yan ML, Yang F, Yang HX, Yang J, Yang YX, Ye MH, Ye YX, Yi ZY, Yu GW, Yuan CZ, Yuan JM, Yuan Y, Zang SL, Zeng Y, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HY, Zhang JW, Zhang JY, Zhang QJ, Zhang XM, Zhang XY, Zhang Y, Zhang ZP, Zhang ZQ, Zhao DX, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zheng HQ, Zheng JP, Zheng ZP, Zhou L, Zhou NF, Zhu KJ, Zhu QM, Zhu YC, Zhu YS, Zhu Y, Zhu ZA, Zhuang BA, Zhuang XA, Zou BS. Measurements of the branching fractions for psi(3770)-->D(0)D[over ](0), D+D-, DD[over ], and the resonance parameters of psi(3770) and psi(2S). Phys Rev Lett 2006; 97:121801. [PMID: 17025950 DOI: 10.1103/physrevlett.97.121801] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2006] [Indexed: 05/12/2023]
Abstract
We measure the branching fractions for psi(3770)-->D(0)D[over ](0), D+D-, DD[over ], and non-DD[over ] to be (46.7+/-4.7+/-2.3)%, (36.9+/-3.7+/-2.8)%, (83.6+/-7.3+/-4.2)%, and (16.4+/-7.3+/-4.2)%, respectively. The resonance parameters of psi(3770) and psi(2S) are measured to be M_(psi(3770))=3772.2+/-0.7+/-0.3 MeV, Gamma_(psi(3770))(tot)=26.9+/-2.4+/-0.3 MeV, and Gamma_(psi(3770))(ee)=251+/-26+/-11 eV; M_(psi(2S))=3685.5+/-0.0+/-0.3 MeV, Gamma_(psi(2S))(tot)=331+/-58+/-2 keV, and Gamma_(psi(2S))(ee)=2.330+/-0.036+/-0.110 keV. We also measure the light hadron R value to be R(uds)=2.262+/-0.054+/-0.109 in the energy region from 3.660 to 3.872 GeV.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing 100049, People's Republic of China
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Ablikim M, Bai JZ, Ban Y, Bian JG, Cai X, Chang JF, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen J, Chen ML, Chen YB, Chi SP, Chu YP, Cui XZ, Dai HL, Dai YS, Deng ZY, Dong LY, Du SX, Du ZZ, Fang J, Fang SS, Fu CD, Fu HY, Gao CS, Gao YN, Gong MY, Gong WX, Gu SD, Guo YN, Guo YQ, Guo ZJ, Harris FA, He KL, He M, He X, Heng YK, Hu HM, Hu T, Huang GS, Huang L, Huang XP, Ji XB, Jia QY, Jiang CH, Jiang XS, Jin DP, Jin S, Jin Y, Lai YF, Li F, Li G, Li HB, Li HH, Li J, Li JC, Li QJ, Li RB, Li RY, Li SM, Li WG, Li XL, Li XQ, Li XS, Liang YF, Liao HB, Liu CX, Liu F, Liu F, Liu HM, Liu JB, Liu JP, Liu RG, Liu ZA, Liu ZX, Lu F, Lu GR, Lu JG, Luo CL, Luo XL, Ma FC, Ma JM, Ma LL, Ma QM, Ma XY, Mao ZP, Mo XH, Nie J, Nie ZD, Olsen SL, Peng HP, Qi ND, Qian CD, Qin H, Qiu JF, Ren ZY, Rong G, Shan LY, Shang L, Shen DL, Shen XY, Sheng HY, Shi F, Shi X, Sun HS, Sun SS, Sun YZ, Sun ZJ, Tang X, Tao N, Tian YR, Tong GL, Varner GS, Wang DY, Wang JX, Wang JZ, Wang K, Wang L, Wang LS, Wang M, Wang P, Wang PL, Wang SZ, Wang WF, Wang YF, Wang Z, Wang Z, Wang Z, Wang ZY, Wei CL, Wei DH, Wu N, Wu YM, Xia XM, Xie XX, Xin B, Xu GF, Xu H, Xu Y, Xue ST, Yan ML, Yang F, Yang HX, Yang J, Yang SD, Yang YX, Ye M, Ye MH, Ye YX, Yi LH, Yi ZY, Yu CS, Yu GW, Yuan CZ, Yuan JM, Yuan Y, Yue Q, Zang SL, Zeng Y, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HY, Zhang J, Zhang JY, Zhang JW, Zhang LS, Zhang QJ, Zhang SQ, Zhang XM, Zhang XY, Zhang YJ, Zhang YY, Zhang Y, Zhang ZP, Zhang ZQ, Zhao DX, Zhao JB, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zhao XJ, Zhao YB, Zhao ZG, Zheng HQ, Zheng JP, Zheng LS, Zheng ZP, Zhong XC, Zhou BQ, Zhou GM, Zhou L, Zhou NF, Zhu KJ, Zhu QM, Zhu YC, Zhu YS, Zhu Y, Zhu ZA, Zhuang BA, Zou BS. Observation of two new N* peaks in J/psi-->ppi-n and ppi+n decays. Phys Rev Lett 2006; 97:062001. [PMID: 17026161 DOI: 10.1103/physrevlett.97.062001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2004] [Indexed: 05/12/2023]
Abstract
The decay J/psi-->NNpi provides an effective isospin 1/2 filter for the piN system due to isospin conservation. Using 58x10(6) J/psi decays collected with the Beijing Electromagnetic Spectrometer at the Beijing Electron Positron Collider, more than 100 thousand J/psi-->ppi-n+c.c. events are obtained. Besides the two well-known N* peaks at around 1500 MeV/c2 and 1670 MeV/c2, there are two new, clear N* peaks in the ppi invariant mass spectrum around 1360 MeV/c2 and 2030 MeV/c2 with statistical significance of 11sigma and 13sigma, respectively. We identify these as the first direct observation of the N*(1440) peak and a long-sought missing N* peak above 2 GeV/c2 in the piN invariant mass spectrum.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing 100039, People's Republic of China
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Ablikim M, Bai JZ, Ban Y, Bian JG, Cai X, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen YB, Chi SP, Chu YP, Cui XZ, Dai YS, Diao LY, Deng ZY, Dong QF, Du SX, Fang J, Fang SS, Fu CD, Gao CS, Gao YN, Gu SD, Gu YT, Guo YN, Guo YQ, Guo ZJ, Harris FA, He KL, He M, Heng YK, Hu HM, Hu T, Huang GS, Huang XT, Ji XB, Jiang XS, Jiang XY, Jiao JB, Jin DP, Jin S, Jin Y, Lai YF, Li G, Li HB, Li HH, Li J, Li RY, Li SM, Li WD, Li WG, Li XL, Li XN, Li XQ, Li YL, Liang YF, Liao HB, Liu BJ, Liu CX, Liu F, Liu F, Liu HH, Liu HM, Liu J, Liu JB, Liu JP, Liu Q, Liu RG, Liu ZA, Lou YC, Lu F, Lu GR, Lu JG, Luo CL, Ma FC, Ma HL, Ma LL, Ma QM, Ma XB, Mao ZP, Mo XH, Nie J, Olsen SL, Peng HP, Ping RG, Qi ND, Qin H, Qiu JF, Ren ZY, Rong G, Shan LY, Shang L, Shen CP, Shen DL, Shen XY, Sheng HY, Sun HS, Sun JF, Sun SS, Sun YZ, Sun ZJ, Tan ZQ, Tang X, Tong GL, Varner GS, Wang DY, Wang L, Wang LL, Wang LS, Wang M, Wang P, Wang PL, Wang WF, Wang YF, Wang Z, Wang ZY, Wang Z, Wang Z, Wei CL, Wei DH, Wu N, Xia XM, Xie XX, Xu GF, Xu XP, Xu Y, Yan ML, Yang HX, Yang YX, Ye MH, Ye YX, Yi ZY, Yu GW, Yuan CZ, Yuan JM, Yuan Y, Zang SL, Zeng Y, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HQ, Zhang HY, Zhang JW, Zhang JY, Zhang SH, Zhang XM, Zhang XY, Zhang Y, Zhang ZP, Zhao DX, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zhao ZG, Zheng HQ, Zheng JP, Zheng ZP, Zhou L, Zhou NF, Zhu KJ, Zhu QM, Zhu YC, Zhu YS, Zhu Y, Zhu ZA, Zhuang BA, Zhuang XA, Zou BS. Observation of a near-threshold enhancement in the omega(phi) mass spectrum from the doubly OZI-suppressed decay J/psi-->gamma(omega)phi. Phys Rev Lett 2006; 96:162002. [PMID: 16712215 DOI: 10.1103/physrevlett.96.162002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2006] [Indexed: 05/09/2023]
Abstract
An enhancement near threshold is observed in the omega(phi) invariant mass spectrum from the doubly Okubo-Zweig-Iizuka-suppressed decays of J/psi-->gamma(omega)phi, based on a sample of 5.8 x 10(7) J/psi events collected with the BESII detector. A partial wave analysis shows that this enhancement favors JP=0+, and its mass and width are M=1812(+19)(-26)(stat)+/-18(syst) MeV/c2 and Gamma=105+/-20(stat)+/-28(syst) MeV/c2. The product branching fraction is determined to be B(J/psi-->gammaX)B(X-->omega(phi))=[2.61+/-0.27(stat)+/-0.65(syst)]x10(-4).
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing 100049, People's Republic of China
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Ablikim M, Bai JZ, Ban Y, Bian JG, Cai X, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen YB, Chi SP, Chu YP, Cui XZ, Dai YS, Deng ZY, Dong LY, Dong QF, Du SX, Du ZZ, Fang J, Fang SS, Fu CD, Gao CS, Gao YN, Gu SD, Gu YT, Guo YN, Guo YQ, Guo ZJ, Harris FA, He KL, He M, Heng YK, Hu HM, Hu T, Huang GS, Huang XP, Huang XT, Ji XB, Jiang XS, Jiao JB, Jin DP, Jin S, Jin Y, Lai YF, Li G, Li HB, Li HH, Li J, Li RY, Li SM, Li WD, Li WG, Li XL, Li XQ, Li YL, Liang YF, Liao HB, Liu CX, Liu F, Liu F, Liu HH, Liu HM, Liu J, Liu JB, Liu JP, Liu RG, Liu ZA, Lu F, Lu GR, Lu HJ, Lu JG, Luo CL, Ma FC, Ma HL, Ma LL, Ma QM, Ma XB, Mao ZP, Mo XH, Nie J, Olsen SL, Peng HP, Qi ND, Qin H, Qiu JF, Ren ZY, Rong G, Shan LY, Shang L, Shen DL, Shen XY, Sheng HY, Shi F, Shi X, Sun HS, Sun JF, Sun SS, Sun YZ, Sun ZJ, Tan ZQ, Tang X, Tian YR, Tong GL, Varner GS, Wang DY, Wang L, Wang LS, Wang M, Wang P, Wang PL, Wang WF, Wang YF, Wang Z, Wang ZY, Wang Z, Wang Z, Wei CL, Wei DH, Wu N, Xia XM, Xie XX, Xin B, Xu GF, Xu Y, Yan ML, Yang F, Yang HX, Yang J, Yang YX, Ye MH, Ye YX, Yi ZY, Yu GW, Yuan CZ, Yuan JM, Yuan Y, Zang SL, Zeng Y, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HY, Zhang JW, Zhang JY, Zhang QJ, Zhang XM, Zhang XY, Zhang YY, Zhang ZP, Zhang ZQ, Zhao DX, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zhao ZG, Zheng HQ, Zheng JP, Zheng ZP, Zhou L, Zhou NF, Zhu KJ, Zhu QM, Zhu YC, Zhu Y, Zhu YS, Zhu ZA, Zhuang BA, Zhuang XA, Zou BS. Observation of a resonance in Chi(1835) in J/psi --> gammapi+ pi- eta-. Phys Rev Lett 2005; 95:262001. [PMID: 16486345 DOI: 10.1103/physrevlett.95.262001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2005] [Indexed: 05/06/2023]
Abstract
The decay channel J/psi --> gamma(pi)(+)pi(-)eta is analyzed using a sample of 5.8 x 10(7) J/psi events collected with the BESII detector. A resonance, the Chi(1835), is observed in the pi(+)pi(-)eta invariant-mass spectrum with a statistical significance of 7.7 sigma. A fit with a Breit-Wigner function yields a mass M = 1833.7 +/- 6.1(stat) +/- 2.7(syst) MeV/c(2), a width Tau = 67.7 +/- 20.3(stat) +/- 7.7(syst) MeV/c(2), and a product branching fraction B(J/psi --> gammaChi) . B(Chi --> pi(+)pi(-)eta) = [2.2 +/- 0.4(stat) +/- 0.4(syst)] x 10(-4). The mass and width of the Chi(1835) are not compatible with any known meson resonance. Its properties are consistent with expectations for the state that produces the strong pp mass threshold enhancement observed in the J/psi --> gammapp process at BESII.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing, People's Republic of China
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Ablikim M, Bai JZ, Ban Y, Bian JG, Cai X, Chang JF, Chen HF, Chen HS, Chen HX, Chen JC, Chen J, Chen J, Chen ML, Chen YB, Chi SP, Chu YP, Cui XZ, Dai HL, Dai YS, Deng ZY, Dong LY, Du SX, Du ZZ, Fang J, Fang SS, Fu CD, Fu HY, Gao CS, Gao YN, Gong MY, Gong WX, Gu SD, Guo YN, Guo YQ, Guo ZJ, Harris FA, He KL, He M, He X, Heng YK, Hu HM, Hu T, Huang GS, Huang L, Huang XP, Ji XB, Jia QY, Jiang CH, Jiang XS, Jin DP, Jin S, Jin Y, Lai YF, Li F, Li G, Li HH, Li J, Li JC, Li QJ, Li RB, Li RY, Li SM, Li WG, Li XL, Li XQ, Li XS, Liang YF, Liao HB, Liu CX, Liu F, Liu F, Liu HM, Liu JB, Liu JP, Liu RG, Liu ZA, Liu ZX, Lu F, Lu GR, Lu JG, Luo CL, Luo XL, Ma FC, Ma JM, Ma LL, Ma QM, Ma XY, Mao ZP, Mo XH, Nie J, Nie ZD, Olsen SL, Peng HP, Qi ND, Qian CD, Qin H, Qiu JF, Ren ZY, Rong G, Shan LY, Shang L, Shen DL, Shen XY, Sheng HY, Shi F, Shi X, Sun HS, Sun SS, Sun YZ, Sun ZJ, Tang X, Tao N, Tian YR, Tong GL, Varner GS, Wang DY, Wang JX, Wang JZ, Wang K, Wang L, Wang LS, Wang M, Wang P, Wang PL, Wang SZ, Wang WF, Wang YF, Wang Z, Wang Z, Wang Z, Wang ZY, Wei CL, Wei DH, Wu N, Wu YM, Xia XM, Xie XX, Xin B, Xu GF, Xu H, Xu Y, Xue ST, Yan ML, Yang F, Yang HX, Yang J, Yang SD, Yang YX, Ye M, Ye MH, Ye YX, Yi LH, Yi ZY, Yu CS, Yu GW, Yuan CZ, Yuan JM, Yuan Y, Yue Q, Zang SL, Zeng Y, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HY, Zhang J, Zhang JY, Zhang JW, Zhang LS, Zhang QJ, Zhang SQ, Zhang XM, Zhang XY, Zhang YJ, Zhang YY, Zhang Y, Zhang ZP, Zhang ZQ, Zhao DX, Zhao JB, Zhao JW, Zhao MG, Zhao PP, Zhao WR, Zhao XJ, Zhao YB, Zhao ZG, Zheng HQ, Zheng JP, Zheng LS, Zheng ZP, Zhong XC, Zhou BQ, Zhou GM, Zhou L, Zhou NF, Zhu KJ, Zhu QM, Zhu YC, Zhu YS, Zhu Y, Zhu ZA, Zhuang BA, Zou BS. Observation of a threshold enhancement in the plambda invariant-mass spectrum. Phys Rev Lett 2004; 93:112002. [PMID: 15447331 DOI: 10.1103/physrevlett.93.112002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2004] [Indexed: 05/24/2023]
Abstract
An enhancement near the m(p)+M(Lambda) mass threshold is observed in the combined pLambda and pLambda invariant-mass spectrum from J/psi-->pK(-)Lambda;+c.c. decays. It can be fit with an S-wave Breit-Wigner resonance with a mass m=2075+/-12(stat)+/-5(syst) MeV and a width of Gamma=90+/-35(stat)+/-9(syst) MeV; it can also be fit with a P-wave Breit-Wigner resonance. Evidence for a similar enhancement is also observed in psi(')-->pK(-)Lambda;+c.c. decays. The analysis is based on samples of 5.8x10(7)J/psi and 1.4x10(7)psi(') decays accumulated in the BES II detector at the Beijing Electron-Positron Collider.
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Affiliation(s)
- M Ablikim
- Institute of High Energy Physics, Beijing 100039, People's Republic of China
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Bai JZ, Ban Y, Bian JG, Cai X, Chang JF, Chen HF, Chen HS, Chen HX, Chen J, Chen JC, Chen J, Chen ML, Chen YB, Chi SP, Chu YP, Cui XZ, Dai HL, Dai YS, Deng ZY, Dong LY, Du SX, Du ZZ, Fang J, Fang SS, Fu CD, Fu HY, Fu LP, Gao CS, Gao ML, Gao YN, Gong MY, Gong WX, Gu SD, Guo YN, Guo YQ, Guo ZJ, Han SW, Harris FA, He J, He KL, He M, He X, Heng YK, Hu HM, Hu T, Huang GS, Huang L, Huang XP, Ji XB, Jia QY, Jiang CH, Jiang XS, Jin DP, Jin S, Jin Y, Lai YF, Li F, Li G, Li HH, Li J, Li JC, Li QJ, Li RB, Li RY, Li SM, Li W, Li WG, Li XL, Li XQ, Li XS, Liang YF, Liao HB, Liu CX, Liu F, Liu F, Liu HM, Liu JB, Liu JP, Liu RG, Liu Y, Liu ZA, Liu ZX, Lu GR, Lu F, Lu JG, Luo CL, Luo XL, Ma FC, Ma JM, Ma LL, Ma XY, Mao ZP, Meng XC, Mo XH, Nie J, Nie ZD, Olsen SL, Peng HP, Qi ND, Qian CD, Qin H, Qiu JF, Ren ZY, Rong G, Shan LY, Shang L, Shen DL, Shen XY, Sheng HY, Shi F, Shi X, Song LW, Sun HS, Sun SS, Sun YZ, Sun ZJ, Tang X, Tao N, Tian YR, Tong GL, Varner GS, Wang DY, Wang JZ, Wang L, Wang LS, Wang M, Wang M, Wang P, Wang PL, Wang SZ, Wang WF, Wang YF, Wang Z, Wang Z, Wang Z, Wang ZY, Wei CL, Wu N, Wu YM, Xia XM, Xie XX, Xin B, Xu GF, Xu H, Xu Y, Xue ST, Yan ML, Yan WB, Yang F, Yang HX, Yang J, Yang SD, Yang YX, Yi LH, Yi ZY, Ye M, Ye MH, Ye YX, Yu CS, Yu GW, Yuan CZ, Yuan JM, Yuan Y, Yue Q, Zang SL, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HY, Zhang J, Zhang JM, Zhang JY, Zhang JW, Zhang LS, Zhang QJ, Zhang SQ, Zhang XM, Zhang XY, Zhang Y, Zhang YJ, Zhang YY, Zhang ZP, Zhang ZQ, Zhao DX, Zhao JB, Zhao JW, Zhao PP, Zhao WR, Zhao XJ, Zhao YB, Zhao ZG, Zheng HQ, Zheng JP, Zheng LS, Zheng ZP, Zhong XC, Zhou BQ, Zhou GM, Zhou L, Zhou NF, Zhu KJ, Zhu QM, Zhu Y, Zhu YC, Zhu YS, Zhu ZA, Zhuang BA, Zou BS. Observation of the decay psi(2S)-->K0SK0L. Phys Rev Lett 2004; 92:052001. [PMID: 14995298 DOI: 10.1103/physrevlett.92.052001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2003] [Indexed: 05/24/2023]
Abstract
The decay psi(2S)-->K(0)(S)K(0)(L) is observed using psi(2S) data collected with the Beijing Spectrometer at the Beijing Electron-Positron Collider; the branching fraction is determined to be B(psi(2S)-->K(0)(S)K(0)(L))=(5.24+/-0.47+/-0.48)x10(-5). Compared with J/psi-->K(0)(S)K(0)(L), the psi(2S) branching fraction is enhanced relative to the prediction of the perturbative QCD "12%" rule. The result, together with the branching fractions of psi(2S) decays to other pseudoscalar meson pairs (pi(+)pi(-) and K+K-), is used to investigate the relative phase between the three-gluon and the one-photon annihilation amplitudes of psi(2S) decays.
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Affiliation(s)
- J Z Bai
- Institute of High Energy Physics, Beijing 100039, People's Republic of China
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26
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Bai JZ, Ban Y, Bian JG, Cai X, Chang JF, Chen HF, Chen HS, Chen J, Chen J, Chen JC, Chen YB, Chi SP, Chu YP, Cui XZ, Dai YM, Dai YS, Dong LY, Du SX, Du ZZ, Dunwoodie W, Fang J, Fang SS, Fu CD, Fu HY, Fu LP, Gao CS, Gao ML, Gao YN, Gong MY, Gong WX, Gu SD, Guo YN, Guo YQ, Guo ZJ, Han SW, Harris FA, He J, He KL, He M, He X, Heng YK, Hong T, Hu HM, Hu T, Huang GS, Huang L, Huang XP, Izen JM, Ji XB, Jiang CH, Jiang XS, Jin DP, Jin S, Jin Y, Jones BD, Ke ZJ, Kong D, Lai YF, Li F, Li G, Li HH, Li J, Li JC, Li K, Li QJ, Li RB, Li RY, Li W, Li WG, Li XQ, Li XS, Liu CF, Liu CX, Liu F, Liu F, Liu HM, Liu JB, Liu JP, Liu RG, Liu Y, Liu ZA, Liu ZX, Lou XC, Lu GR, Lu F, Lu HJ, Lu JG, Lu ZJ, Luo XL, Ma EC, Ma FC, Ma JM, Malchow R, Mao ZP, Meng XC, Mo XH, Nie J, Nie ZD, Olsen SL, Paluselli D, Peng HP, Qi ND, Qian CD, Qiu JF, Rong G, Shen DL, Shen H, Shen XY, Sheng HY, Shi F, Song LW, Sun HS, Sun SS, Sun YZ, Sun ZJ, Tang SQ, Tang X, Tian D, Tian YR, Toki W, Tong GL, Varner GS, Wang J, Wang JZ, Wang L, Wang LS, Wang M, Wang M, Wang P, Wang PL, Wang WF, Wang YF, Wang Z, Wang Z, Wang Z, Wang ZY, Wei CL, Wu N, Xia XM, Xie XX, Xu GF, Xu Y, Xue ST, Yan ML, Yan WB, Yang GA, Yang HX, Yang J, Yang SD, Ye MH, Ye YX, Ying J, Yu CS, Yu GW, Yuan CZ, Yuan JM, Yuan Y, Yue Q, Zang SL, Zeng Y, Zhang BX, Zhang BY, Zhang CC, Zhang DH, Zhang HY, Zhang J, Zhang JM, Zhang JW, Zhang LS, Zhang QJ, Zhang SQ, Zhang XY, Zhang YJ, Zhang Y, Zhang YY, Zhang ZP, Zhao DX, Zhao J, Zhao JW, Zhao PP, Zhao WR, Zhao YB, Zhao ZG, Zheng JP, Zheng LS, Zheng ZP, Zhong XC, Zhou BQ, Zhou GM, Zhou L, Zhou NF, Zhu KJ, Zhu QM, Zhu Y, Zhu YC, Zhu YS, Zhu ZA, Zhuang BA, Zou BS. Observation of a near-threshold enhancement in the pp mass spectrum from radiative J/psi-->gammapp decays. Phys Rev Lett 2003; 91:022001. [PMID: 12906471 DOI: 10.1103/physrevlett.91.022001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2003] [Indexed: 05/24/2023]
Abstract
We observe a narrow enhancement near 2m(p) in the invariant mass spectrum of pp pairs from radiative J/psi-->gammapp decays. No similar structure is seen in J/psi-->pi(0)pp decays. The results are based on an analysis of a 58 x 10(6) event sample of J/psi decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an S- or P-wave Breit-Wigner resonance function. In the case of the S-wave fit, the peak mass is below 2m(p) at M=1859(+3)(-10) (stat)+5-25(syst) MeV/c(2) and the total width is Gamma<30 MeV/c(2) at the 90% confidence level. These mass and width values are not consistent with the properties of any known particle.
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Affiliation(s)
- J Z Bai
- Institute of High Energy Physics, Beijing 100039, People's Republic of China
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27
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Bai JZ, Ban Y, Bian JG, Chen AD, Chen HF, Chen HS, Chen JC, Chen XD, Chen YB, Cheng BS, Chi SP, Chu YP, Choi JB, Cui XZ, Dai YS, Dong LY, Du ZZ, Dunwoodie W, Fu HY, Fu LP, Gao CS, Gu SD, Guo YN, Guo ZJ, Han SW, Han Y, Harris FA, He J, He JT, He KL, He M, He X, Hong T, Heng YK, Hu GY, Hu HM, Hu QH, Hu T, Huang GS, Huang XP, Huang YZ, Izen JM, Ji XB, Jiang CH, Jin Y, Jones BD, Kang JS, Ke ZJ, Kim HJ, Kim SK, Kim TY, Kong D, Lai YF, Li D, Li HB, Li HH, Li J, Li JC, Li PQ, Li QJ, Li RY, Li W, Li WG, Li XN, Li XQ, Liu B, Liu F, Liu F, Liu HM, Liu J, Liu JP, Liu TR, Liu RG, Liu Y, Liu ZX, Lou XC, Lu GR, Lu F, Lu JG, Lu ZJ, Luo XL, Ma EC, Ma JM, Malchow R, Mao HS, Mao ZP, Meng XC, Mo XH, Nie J, Nie ZD, Olsen SL, Paluselli D, Park H, Qi ND, Qi XR, Qian CD, Qiu JF, Que YK, Rong G, Shao YY, Shen BW, Shen DL, Shen H, Shen XY, Sheng HY, Shi F, Shi HZ, Song XF, Suh JY, Sun HS, Sun LF, Sun YZ, Tang SQ, Toki W, Tong GL, Varner GS, Wang J, Wang JZ, Wang L, Wang LS, Wang P, Wang PL, Wang SM, Wang YY, Wang ZY, Wei CL, Wu N, Xi DM, Xia XM, Xie XX, Xu GF, Xu Y, Xue ST, Yan WB, Yan WG, Yang CM, Yang CY, Yang GA, Yang HX, Yang W, Yang XF, Ye MH, Ye SW, Ye YX, Yu CS, Yu CX, Yu GW, Yuan Y, Zhang BY, Zhang C, Zhang CC, Zhang DH, Zhang HL, Zhang HY, Zhang J, Zhang JW, Zhang L, Zhang LS, Zhang P, Zhang QJ, Zhang SQ, Zhang XY, Zhang YY, Zhang ZP, Zhao DX, Zhao HW, Zhao J, Zhao JW, Zhao M, Zhao PP, Zhao WR, Zhao YB, Zhao ZG, Zheng JP, Zheng LS, Zheng ZP, Zhou BQ, Zhou GM, Zhou L, Zhu KJ, Zhu QM, Zhu YC, Zhu YS, Zhu ZA, Zhuang BA, Zou BS. Measurements of the cross section for e(+)e(-) --> hadrons at center-of-mass energies from 2 to 5 GeV. Phys Rev Lett 2002; 88:101802. [PMID: 11909342 DOI: 10.1103/physrevlett.88.101802] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2001] [Indexed: 05/23/2023]
Abstract
We report values of R = sigma(e(+)e(-)-->hadrons)/sigma(e(+)e(-)-->mu(+)mu(-)) for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider.
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Affiliation(s)
- J Z Bai
- Institute of High Energy Physics, Beijing 100039, People's Republic of China
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28
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Huang Y, Zhao DX, Lu DP, Yan F, Li ZH, Chen HZ, Zhao Q. [Studies on the cell suspension culture of Saussarea medusa in a stirred tank bioreactor]. Sheng Wu Gong Cheng Xue Bao 2001; 17:561-5. [PMID: 11797222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
The cell suspension culture of Saussarea medusa in a 2L aerated and agitated bioreactor with a four-pitch-blade impeller was investigated. The effects of agitation speed, aeration and inoculum size on cell growth and flavonoids production were studied and it was found that cells had optimum growth and flavonoids production when cultivated at 75 r/min, 700-1000 L/min and an inoculum of 4.0-5.0 g/L. A high cell biomass of 13.8 g/L and flavonoids production of 416 mg/L were achieved after 12 days of cultivation. Time course study revealed that flavonoids biosynthesis was growth-associated. The studies on aggregates size distribution in the bioreactor showed that the aggregates break-up caused by hydrodynamic stress might adversely affect cell growth and lead to significant reduction of cell biomass and flavonoids production.
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Affiliation(s)
- Y Huang
- Institute of Botany, Chinese Academy of Sciences, State Key Laboratory of Biochemical Engineering, Institute of Chemical Metallurgy, Beijing, China
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29
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Abstract
The effects of extracts from Ganoderma lucidum spores on the growth of human cervix uteri tumor HeLa cells as well as on the cell cycle and intracellular calcium level were investigated. Alcohol extracts were prepared from sporoderm-broken and sporoderm-nonbroken spores (termed extract I and extract II) of G. lucidum. Extract I was then subjected to silica gel chromatography to obtain extract III. Cytotoxicity was examined by means of trypan blue exclusion and MTT tests. It was found that extract I and extract III, but not extract II strongly inhibited the growth of HeLa cells, and that extract III was more effective than extract I. Moreover, extract III was shown to be capable of blocking the cell cycle at the transition from G1 to S phase and inducing a marked decrease of intracellular calcium level, determined by flow cytometry and the specific fluorescent calcium probe Fura-2, respectively. These results imply that (1) the breaking of G. lucidum spores improves the release of cytotoxic activity and (2) the effective extract might influence the cell cycle and cellular signal transduction by altering the calcium transport system.
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Affiliation(s)
- H S Zhu
- Research Center of Materials Science, Beijing Institute of Technology, China.
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30
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Zhao DX, Yang XL, Chen L, Wang BW, Xu JL, Zhu HS. [Extraction and separation of antitumor components from Ganoderma lucidum (Leyss. ex Fr.) Karst]. Zhongguo Zhong Yao Za Zhi 2000; 25:288-90. [PMID: 12512451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To examine the variation of alcohol extraction rates of Ganoderma lucidum spores with different rates of wall-wrack, and analyze the antitumor components of alcohol extract by chromatography. METHOD The G. lucidum spores were soaked and extracted with absolute alcohol. The alcohol extract was chromatographed on a silica gel column and HPLC in proper order, and the antitumor activity of every eluted fraction was represented by its cytotoxicity towards Hela cells. RESULT Extraction rates 5%, 25% and 33% corresponded to wall-wrack rates 0%, 60%-80% and 99% respectively. The alcohol extract from spores with the highest wall-wrack rate was chromatographed on a silica gel column, eluting successfully with CHCl3, EtOAc and CH3OH in order. The CHCl3 fraction had not any antitumor activity, while this activity of CH3OH fraction was 34 times greater than that of EtOAc fraction. HPLC analysis found out that two mixtures(II1 and II3) possess significant antitumor activity in vitro. CONCLUSION The weight of alcohol extract from spores with wall-wrack was far greater than that of spores without. The antitumor components of G. lucidum spores could be analyzed with methanol-water on a reverse HPLC.
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Affiliation(s)
- D X Zhao
- Research Center of Material Sciences, Beijing Institute of Technology, Beijing 100081, China
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31
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Zhao DX, Li MY. [Effects of media on the production of flavonoids by suspension cultures of Saussurea medusa]. Sheng Wu Gong Cheng Xue Bao 2000; 16:99-102. [PMID: 10883287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Flavonoids were produced from cell suspension cultures of Saussurea medusa. The results of studies on eight types of culture media showed that the MS medium was the best for cell growth and flavonoids formation, We investigated the effects of all the components of MS medium on the cell growth and flavonoids production, and found that carbon, nitrogen and phytohormone had especially marked effects. With MG medium a modified MS medium, the yield of cell growth was 24.8 g(dwt)/L, with MP medium another modified MS mediums, the yield of flavonoids production was 1. 75 g/L. The yield of cell growth and flavonoids production in MG and MP medium were 32% and 70% higher than that in MS medium respectively.
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Affiliation(s)
- D X Zhao
- Institute of Botany, Chinese Academy of Sciences, Beijing.
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32
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Abstract
Submerged cultures of the low-production strain of Tolypocladium inflatum DSM 63544 formed a mixture of cyclosporins (CS) consisting of CS-A, CS-B, "CS-3" and "CS-4". Glucose, sucrose and maltose were highly favored for biomass production but provided a different physiological state necessary for CS biosynthesis. Not only the magnitude of CS production but also the proportion of individual components of the CS mixture were affected by the C source. Intensive CS synthesis was in correlation with the formation of CS-3. Lower yields of CS were accompanied by an increased proportion of CS-A in the CS complex. The best specific production of CS was achieved on the glucose medium, the highest yield of CS-A on the maltose medium. There was no remarkable relationship between the biomass formation and the intensity of CS synthesis.
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Affiliation(s)
- D X Zhao
- International Postgraduate Training Course UNESCO-ROSTE, Prague
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